2001111202001 has 4 divisors (see below), whose sum is σ = 2001125319732. Its totient is φ = 2001097084272.

The previous prime is 2001111201989. The next prime is 2001111202021. The reversal of 2001111202001 is 1002021111002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12221523601 + 1988889678400 = 110551^2 + 1410280^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001111202001 - 2¹⁸ = 2001110939857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001111202021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6844070 + ... + 7130463.

It is an arithmetic number, because the mean of its divisors is an integer number (500281329933).

Almost surely, 2^{2001111202001} is an apocalyptic number.

It is an amenable number.

2001111202001 is a deficient number, since it is larger than the sum of its proper divisors (14117731).

2001111202001 is a wasteful number, since it uses less digits than its factorization.

2001111202001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14117730.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 2001111202001 its reverse (1002021111002), we get a palindrome (3003132313003).

Subtracting from 2001111202001 its reverse (1002021111002), we obtain a palindrome (999090090999).

The spelling of 2001111202001 in words is "two trillion, one billion, one hundred eleven million, two hundred two thousand, one".